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In most mammalian species, development to the blastocyst stage is reached after the embryo passes from the oviduct into the uterus. Blastocyst formation has also been observed in fertilized ova retained in the oviduct of the mouse (Kirby, 1962; Orsini & McLaren, 1967), rat (Alden, 1942) and rabbit (Adams, 1958) following the placing of a ligature at the uterotubal junction. Early mouse (Whitten, 1956; Brinster, 1963; Whitten & Biggers, 1968), rabbit (Kane & Foote, 1970) and rat (Folstad, Bennett & Dorfman, 1969) embryos have even been cultured to the blastocyst stage in vitro in a chemically defined medium. Billington, Graham & McLaren (1968) reported that tubal mouse embryos cultured in vitro to the blastocyst stage and transferred to an ectopic site were capable of forming well-differentiated embryos.
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Pope et al. (1972) studied this question.
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